Advanced module
Module 15: Advanced Concurrency and Async Design
Build Java systems that stay correct under parallel work. This module covers task modeling, shared-state safety, executors, async composition, failure modes, and one realistic concurrency mini-project.
Module lessons
Module 15: Advanced Concurrency and Async Design
Thread Lifecycle, Tasks, `Runnable`, and `Callable`
Build a strong mental model for how work starts, runs, waits, and finishes in Java. You will compare raw threads with task objects, understand where `Future` fits, and learn why advanced code usually models work as tasks first and threads second.
Synchronization, `volatile`, and Shared State
Learn how visibility and atomicity problems appear in shared mutable state. This lesson shows what `synchronized` guarantees, where `volatile` is useful, and how to reason about small safe designs instead of guessing based on timing.
Locks, Conditions, and Atomics
Go beyond intrinsic locks when you need timed locking, explicit signaling, or lock-free counters. You will compare `ReentrantLock`, condition objects, and atomic classes so you can choose the lightest tool that still keeps the code correct.
Executor Services, Thread Pools, and Task Scheduling
Use executor services to manage concurrency deliberately instead of creating threads everywhere. This lesson covers pool choices, shutdown strategy, backpressure concerns, and where modern virtual-thread executors can simplify blocking work.
CompletableFuture for Async Pipelines
Compose asynchronous work in readable steps instead of nesting callbacks or blocking too early. You will transform results, combine independent tasks, recover from failures, and learn where blocking still sneaks into supposedly async code.
Race Conditions, Deadlocks, and Other Concurrency Failures
Study the failure modes that make concurrent systems hard to trust: races, deadlocks, starvation, livelock, leaks, and hidden contention. You will learn how they happen and what code-review habits reduce the risk before production traffic exposes them.
Mini-Project: Concurrent Download Manager
Build a realistic concurrent download manager that queues work, tracks progress, limits concurrency, and reports failures clearly. The goal is not only to “use threads,” but to design a small system that stays understandable under parallel load.
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